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High-resolution crystal structure of an artificial (betaalpha)(8)-barrel protein designed from identical half-barrels.

Höcker, Birte ; Lochner, Adriane ; Seitz, Tobias ; Claren, Jörg ; Sterner, Reinhard


Ample evidence suggests that the ubiquitous (betaalpha)(8)-barrel enzyme fold has evolved by the duplication and fusion of an ancestral (betaalpha)(4)-half-barrel. To reconstruct this process in the laboratory with a model protein, we earlier fused two copies of the C-terminal half-barrel HisF-C of imidazole glycerol phosphate synthase (HisF) and stepwise stabilized the resulting HisF-CC ...


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